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Leaving Cert Biology - > Homeostasis > Flashcards

Homeostasis Flashcards

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1
Q

What is homeostasis

A

The maintenance of a constant internal environment within the body

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2
Q

Why do we need homeostasis

A

Body and cells need the right conditions to preform at their best

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3
Q

What factors can change

A

Temperature
Ph
Solute concentration
Oxygen

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4
Q

Waste products of the body

A

CO2

Urea

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5
Q

How is carbon dioxide produced and removed.

A

Respiration

Lungs

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6
Q

How is urea produced and removed

A

Produced by liver breaking down amino acids

Removed by kidneys and bladder

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7
Q

Internal organs control

A

Temperature (liver)
Ion content
Water content
Blood glucose

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8
Q

Temperature is increased by what when body is cold

A

Shivering
Blood vessels contracting
Body hair stand

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9
Q

How is heat released from body

A

Sweating
Body hair flat
Blood vessels expand

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10
Q

How is ion content increased

A

Eating

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11
Q

How is ion content reduced

A

Sweating and urine

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12
Q

How is water content increased

A

Drinking

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13
Q

How is water content decreased

A

Sweating and urine

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14
Q

How is blood glucose increased and decreased

A

Hormone

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15
Q

How does homeostasisknow to work

A

Negative feedback

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16
Q

What are endotherms

A

Animals with warm blood

17
Q

Examples of endotherms

A

Mammals and birds

18
Q

What are animals with warm blood known as

A

Endotherms

19
Q

What are animals with cold blood called

A

Ectotherms

20
Q

What are ectotherms

A

Animals with cold blood

21
Q

Examples of ectotherms

A

Fish

Reptiles

22
Q

Example of homeostasis working in humans

A

Control of body water temperatures

23
Q

Needs for water in organisms

A

Metabolism
For chemical reactions
Movement of materials in and out of cells
Temperature control

24
Q

How is water lost from body

A

Lungs - exhaling
Skin - sweat
Intestines - in faeces
Kidneys - in urea

25
Q

What controls water levels in body (osmoregulatory organs)

A

Kidneys

Leaving Cert Biology - (41 decks)

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